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@INPROCEEDINGS{Wuttig:905435,
      author       = {Wuttig, Matthias},
      title        = {{M}etavalent {B}onding in {P}hase {C}hange
                      {M}aterials:{P}rovocation or {P}romise?},
      reportid     = {FZJ-2022-00676},
      year         = {2021},
      abstract     = {Scientists and practitioners have long dreamt of designing
                      materials with novel properties. Yet, a hundred years after
                      quantum mechanics lay the foundations for a systematic
                      description of the properties of solids, it is still not
                      possible to predict the best material in applications such
                      as photovoltaics, superconductivity or thermoelectric energy
                      conversion. This is a sign of the complexity of the problem,
                      which is often exacerbated by the need to optimize
                      conflicting material properties. Hence, one can ponder if
                      design routes for materials can be devised. In recent years,
                      the focus of our work has been on designing advanced
                      functional materials with attractive opto-electronic
                      properties, including phase change materials,
                      thermoelectrics, photonic switches and materials for
                      photovoltaics. Phase Change Materials have provided a
                      special challenge for materials optimization. They possess a
                      remarkable property portfolio, which includes the ability to
                      rapidly switch between the amorphous and crystalline state.
                      Surprisingly, in PCMs both states differ significantly in
                      their properties [1]. This material combination makes them
                      very attractive for applications in rewriteable optical and
                      electronic data storage, as well as photonic switches [2-4].
                      In this talk, the unconventional material properties will be
                      attributed to a unique bonding mechanism (metavalent
                      bonding) [5]. Further evidence for this bonding mechanism
                      comes from a quantum-chemical map, which separates the known
                      strong bonding mechanisms of metallic, ionic and covalent
                      bonding [6]. The map reveals that metavalent bonding is a
                      new, fundamental bonding mechanism. This insight is
                      subsequently employed to design phase change [7] as well as
                      thermoelectric materials [8]. Yet, the discoveries presented
                      here also force us to revisit the concept of chemical bonds
                      and bring back a history of vivid scientific disputes about
                      ‘the nature of the chemical bond’.},
      month         = {Sep},
      date          = {2021-09-13},
      organization  = {EPCOS 2021, Oxford (UK), 13 Sep 2021 -
                       15 Sep 2021},
      subtyp        = {Other},
      cin          = {PGI-10},
      cid          = {I:(DE-Juel1)PGI-10-20170113},
      pnm          = {5233 - Memristive Materials and Devices (POF4-523)},
      pid          = {G:(DE-HGF)POF4-5233},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/905435},
}